イヴァンナ・ヴェンチュラのインスタグラム(yoventura) - 10月1日 03時11分

Using a medicine ball works your core to the max. Try these crunches with legs raised. Crunch up with medicine ball making sure you raise it above knees. Do 3 sets of 20. Using a stability ball creates a more intense crunch, you have to crunch as well as use other muscles to keep your balance. With the medicine ball crunch in and out making sure you keep your muscles tight! Do 3 sets of 15.

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